[webaudio] Readme (#4960)
[webaudio] Readme (#4960)

Initiative to provide a Readme to all addon directories. Sometimes you really don't know what they are for.

Signed-off-by: davidgraeff <cddf4d21ffd604ccd3fdffe1267f1f9d72e179ea@web.de>
clinique/openhab2,clinique/openhab2,Snickermicker/openhab2,digitaldan/openhab2,clinique/openhab2,gerrieg/openhab2,theoweiss/openhab2,theoweiss/openhab2,Snickermicker/openhab2,theoweiss/openhab2,digitaldan/openhab2,clinique/openhab2,theoweiss/openhab2,Snickermicker/openhab2,digitaldan/openhab2,gerrieg/openhab2,gerrieg/openhab2,Snickermicker/openhab2,digitaldan/openhab2,gerrieg/openhab2